In my TrimmedWindow there is a WindowTrim with a Toolbar. This Toolbar is on top. Now I have four items and one separator item between the first two items and the other two items. The separator should create a little space between the two item groups. So my approach was to set .MToolBarSeparator{margin-left: 100px;} in my css. This doesn't work. Do I have to do something else, to achieve this?